A psuedo English slang used by a small number of Japanese school children to mean intercourse. Usually associated with a pelvic thrust to enhance meaning.

This slang has become very popular among middle school children in a certain part of Japan. It was originally coined by several boys who were talking to their english teacher to figure out how to say the slang for thrust in english. Despite the teacher discouraging them from using such poor english, the children continued to use the slang in and out of class, wherever possible.
1.Kid 1: (pointing at girl) Waist-shake?
Kid 2: Oh, yes, yes, waist-shake!

2.English teacher: What do you do after school?
Kids: (While demonstrating pelvic thrust) WAIST-SHAKE!!
2nd English teacher: (While mimicking pelvic thrust quizically) Waist-Shake?
by Arcwhite June 21, 2005
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by freds June 20, 2005
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